@article{MZ_1980__171_172930,
     author = {Wolfgang Willems},
     title = {On the {Projectives} of a {Group} {Algebras.}},
     journal = {Mathematische Zeitschrift},
     pages = {163--174},
     publisher = {mathdoc},
     volume = {171},
     year = {1980},
     zbl = {0435.20005},
     url = {http://geodesic.mathdoc.fr/item/MZ_1980__171_172930/}
}